/Engine/Source/Editor/PackagesDialog/Public/PackagesDialog.h
Adds a new button to the package dialog window
virtual void AddButton ( EDialogReturnType Type, EDialogButtonStyle ButtonStyle, const [FText](API\Runtime\Core\Internationalization\FText) & Name, const [FText](API\Runtime\Core\Internationalization\FText) & ToolTip, [TAttribute](API\Runtime\Core\Misc\TAttribute)< bool > Disabled )